Chain saw.



H. E. MARTIN.

CHAIN SAW.

APPLICATION FILED AUG. v, 1913.

1,107,625.. Patented Aug. 18,1914.

awuomto'o Maw/n0 1 0 W612? Mk n To all whom may concern i UNITED STAWENT10 53 HORACE E. MARTIN, or Arrrmrs, GEORGIA. I

' CHAIN SAW.

13. MARTIN, at

Be it known that I, Homer. a citizen of the United States, residingAthens, in the county of Clarke and bt-ate' claimed.

In the drawings, Figure 1 is aside view of a portion of a chain sawconstruct accord ing .to this invention. Fig. 2 is a similar side viewwith one row of side links and cutting teeth removed, and showing indotted lines the outline of the beveled portions which form the teeth ofthe other row of side links. Fig. 3 is a plan view of a portion of thechain saw. Fig. 4 is a crosssection, taken on the line w-m in Fig. 1.

The chain saw is formed of an endless chain of pivoted links providedwith teeth, and it is adapted to run on a supporting frame of anyapproved construction, and to be driven by any approved drivingmechanism.

Three kinds of side links 2, 3 and 4 are provided and are arrangedopposite to each other in pairs. One pair of side links 2 is arrangedalternately of each two airs of side links 3 and 4, and the side lin {s2 are connecting and supporting links only, and are not provided withcuttin teeth. The side teeth 3 and 4 are provide with cutting teeth 5,and these teeth are made in various shapes in carrying out thisinvention. The cutting teeth arepreferably made of the shape shown,being curved forwardly and pro ecting over the front endsof the links 7to which they pertain for about one-half the length of the links.

Y The front end portions of the shanks of the cutting teeth of the links3 rest against the upper rear end portions of the connecting links 2,and the front end portions of the shanks of the cutting teeth of thelinks 4" rest against the rear end portions of the shanks of the cuttingteeth of the links 3. The shanks of the cutting teeth of the linksSpecification of Letters Patent. Application filed. August 7, 1913.Serial No. 783,688.

Patented AugQlB,3,914.

3 land 4 difi'er somewhat in shape, but the cutting portions of theteeth 5 are preferabl alike. v

I Lachside link has an inclined projection 6 at 1ts rear end, whichoverla s an inclined pro ection 7 on the front en ad acent link, andprevents the saw from bending in one direction.

Three kinds of center links 8, 9 and 10 are provlded, and are arrangedalternately in regular order.

of the next I The center links 8 are profi,

vided with forwardly projecting drag teeth i or planer teeth 12, theside portions 14 of which are wider than the links 8 so that they formstops which rest on the tops of the connecting side links 2. The dratooth links 8 are pivoted to the real" en portions of the side links iand to the front end portions of the connecting side links 2 by pivotpins 15. The drag teeth are hook-shaped, and

have rearwardly and upwardly inclined shanks 16.

The center links 9 are provided with gage teeth 17, and are pivoted bypins 18 to the rear end. ortions of the connecting Side links 2 an tothe front end side links 3. The gage teeti project over each end of thelinks 9. and are arran cd to extend between the top portions of theadjacent pairs of cutting teeth 5. Thefront ortions of the end portions19 of the shanks of the gage teeth are curved and they overlap the dragteeth and their shanks.

The center links 10 are pivoted by pins 20 to the rear end portions ofthe side links 3 and to the front end portions of the side links 4. Thecenter links 10 have upwardly projecting lugs 21 which forrn abutmentsfor the rear end portions of the'gage teeth and their shanks.

All the center links have downwardly projecting lugs 22, or otherapproved means, for engaging with the driving wheel or wheels by whichthe saw is operated. The overlapping portion of the, links and theshanks of the teeth prevent the saw from bending in one direction whenthe saw is straight, and permit it to bend in the opposite direction sothat it may pass over and engage with the supporting and driving wheels.These overlapping portions also strengthen or stiffen the teeth andprevent vibrations, and enable the saw to be used to advantage as across-cut saw for green lumber. As the drag teeth have laterallyprojecting side' portions they plane out the whole of the wood which hasbeen sliced by the cutting teeth. The gage teeth prevent the cutting anddrag teeth from cutting too deeply at a single cut, and the saw is thereby relieved from too much strain.

, What I claim is:

1. In a chain saw, the combination, with side links arranged in pairs insets of three, each two adjacent pairs of side links being, providedwith cutting teeth, and the re-' maining pair being connectingilinksrof. three series of center links arranged in line with each other andpivoted to the side links, one series of center links being providedwith drag teeth, the second series having gage teeth, and the thirdseries being connecting links.

2. In a chain saw, the combination, with side links arranged in pairs insets of three, two adjacent pairs of the side links being; provided withforwardly and upwardly? curved cutting teeth which project longi.-'tudinally beyond the ends of the links toj' which they pertain, and theremaining pairf being connecting links; of three series oi center linksarranged inline with each other and pivoted to the side links, oneseries of; center links being provided with drag teeth, the secondseries having gage teeth, and the? third series being connecting links.

3. In a chain saw, the combination, with side links certain of which areprovidedi with forwardly projecting cutting teeth; arranged opposite toeach other in pairs, of; center links pivoted to the side links,'certainof thecenter links being provided with drag teeth havinglaterally projecting portions for the projecting front end portions? ofthe cutting teeth to overlap and rest 011/ 4. In a chain saw, thecombination, with; side links certain of which are provided with cuttingteeth, of center links pivotedi to the side links, certain of the centerlinks: being provided with drag teeth, hai ingZ laterally projectingside portions which rest menses on the connecting side links between thetoothed side links.

In a chain saw, the combination, with sidelinks provided with cuttingteeth arranged opposite to each other in pairs, of

center links pivoted to the side' links, .cer

tain of the center links being provided with gage teeth which extendlongitudinally be- "tween the cutting portions of two adjacent pairs ofcutting teeth.

6. In a chain saw, the combination, with side links provided withcutting teetharranged opposite to each other-in pairsfof center linkspivoted'to the side linksfcer i tain of the center links being providedwith gage teeth which extend longitudinallybetween the cutting portionsof two adjacent pairs of cutting teeth, and the center links next behindthose with the gage teeth being 2 ing end portions which overlap. anrein force the shanks of the drag teeth: 8. In a chain saw,the'combination, With side links certain of which are provided withforwardly projecting cutting teeth arr signature in the presence-of twowitnesses. I

HORACE 6E. MARTIN."

Witnesses:

HUGH I-I. GORDON, J12, HA RY, E. Towns.

